/* SPDX-License-Identifier: BSD-3-Clause */
/*
 * Copyright (c) 2019, NEC Europe Ltd., NEC Corporation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the copyright holder nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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 */
#ifndef __PLAT_CMN_X86_TLS_H__
#define __PLAT_CMN_X86_TLS_H__

#include <x86/cpu.h> /* rdmsrl, wrmsrl */
#include <uk/arch/lcpu.h>

/* TODO: On latest CPUs a faster instruction can be used:
 * https://www.kernel.org/doc/html/latest/x86/x86_64/fsgs.html
 *  #accessing-fs-gs-base-with-the-fsgsbase-instructions
 */

#define get_tls_pointer() rdmsrl(X86_MSR_FS_BASE)

#define set_tls_pointer(ptr) wrmsrl(X86_MSR_FS_BASE, ptr)

#endif /* __PLAT_CMN_X86_TLS_H__ */
